fix(lobby): ship real portal textures; they pointed at vanilla paths

The four portal blocks referenced vanilla texture paths from their own pack
(emerald_block, amethyst_block, prismarine_bricks, end_portal_frame_top)
without shipping those files. While the blocks rendered through the legacy
blocks.json path this was invisible; once minecraft:geometry made
material_instances take effect the lookup failed outright and they rendered
as missing-texture.

Ships real 16x16 textures generated through scripts/build-textures.py: a dark
stone frame around a glowing field, one hue per destination -- jamie green,
lyla purple, mya teal, plus a gold-ringed frame. terrain_texture.json now
points at these instead of vanilla paths, so every key in the pack resolves
to a file the pack actually contains.

lobby_transfer_RP bumped to 1.0.1 so clients re-download rather than serving
cached art; the lobby world pin was updated to match.

Known issue, not fixed here: lobby_transfer_RP and hub_return_transfer_BP
share pack UUID b2c3d4e5-1111-2222-3333-fedcba654321. They never load on the
same server today, so the collision is latent, but it makes version bumps on
either pack risky and should be resolved with a fresh UUID plus a pin update.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015Gf1kZypRDfPL1YiWUS1LC

scripts/build-textures.py

@@ -482,12 +482,68 @@ def redstone_link_rx() -> Image.Image:
     return img
 
 
+# ── Lobby portal blocks ────────────────────────────────────
+# These previously pointed terrain_texture.json at vanilla paths
+# (emerald_block, amethyst_block, prismarine_bricks, end_portal_frame_top)
+# which a custom pack cannot resolve, so they rendered as missing-texture
+# once minecraft:geometry made material_instances take effect. Ship real
+# textures instead: a dark stone frame around a glowing field, one hue per
+# child, so the three destinations are distinguishable at a glance.
+
+PORTAL_STONE = (58, 60, 68)
+PORTAL_STONE_HL = (86, 89, 99)
+PORTAL_STONE_SH = (34, 35, 41)
+
+def _portal_face(core, bright, glow):
+    img = Image.new("RGBA", (16, 16), PORTAL_STONE)
+    # chiselled frame
+    rect(img, 0, 0, 15, 0, PORTAL_STONE_HL)
+    rect(img, 0, 0, 0, 15, PORTAL_STONE_HL)
+    rect(img, 0, 15, 15, 15, PORTAL_STONE_SH)
+    rect(img, 15, 0, 15, 15, PORTAL_STONE_SH)
+    rect(img, 2, 2, 13, 13, PORTAL_STONE_SH)
+    # glowing field
+    rect(img, 3, 3, 12, 12, core)
+    rect(img, 4, 4, 11, 11, bright)
+    rect(img, 6, 6, 9, 9, glow)
+    # corner sparks so the field reads as energy, not flat paint
+    for cx, cy in ((4, 4), (11, 4), (4, 11), (11, 11)):
+        px(img, cx, cy, glow)
+    # dark centre seam
+    rect(img, 7, 7, 8, 8, core)
+    return img
+
+def portal_jamie():   return _portal_face((22, 92, 40), (46, 156, 66), (140, 240, 150))
+def portal_lyla():    return _portal_face((78, 40, 130), (126, 74, 190), (214, 168, 255))
+def portal_mya():     return _portal_face((22, 96, 104), (46, 152, 160), (150, 238, 244))
+
+def portal_frame():
+    img = Image.new("RGBA", (16, 16), PORTAL_STONE)
+    rect(img, 0, 0, 15, 0, PORTAL_STONE_HL)
+    rect(img, 0, 0, 0, 15, PORTAL_STONE_HL)
+    rect(img, 0, 15, 15, 15, PORTAL_STONE_SH)
+    rect(img, 15, 0, 15, 15, PORTAL_STONE_SH)
+    # inset panel with a dull gold ring, echoing an end portal frame
+    rect(img, 3, 3, 12, 12, (48, 50, 57))
+    for x in range(4, 12):
+        px(img, x, 4, GOLD); px(img, x, 11, GOLD)
+    for y in range(4, 12):
+        px(img, 4, y, GOLD); px(img, 11, y, GOLD)
+    rect(img, 6, 6, 9, 9, (70, 66, 40))
+    px(img, 7, 7, GOLD_BRIGHT); px(img, 8, 8, GOLD_BRIGHT)
+    return img
+
+
 def main() -> None:
     save(smart_crafting_table(), "smart-crafting-addon/smart_crafting_RP/textures/blocks/smart_crafting_table.png")
     save(post_office_block(), "postal-service-addon/postal_service_RP/textures/blocks/post_office.png")
     save(mailbox_block(), "postal-service-addon/postal_service_RP/textures/blocks/mailbox.png")
     save(tent_canvas(), "camping-supplies-addon/camping_supplies_RP/textures/blocks/tent_canvas.png")
     save(portal_field(), "lobby-addon/lobby_transfer_RP/textures/blocks/portal_field.png")
+    save(portal_frame(), "lobby-addon/lobby_transfer_RP/textures/blocks/portal_frame.png")
+    save(portal_jamie(), "lobby-addon/lobby_transfer_RP/textures/blocks/portal_jamie.png")
+    save(portal_lyla(),  "lobby-addon/lobby_transfer_RP/textures/blocks/portal_lyla.png")
+    save(portal_mya(),   "lobby-addon/lobby_transfer_RP/textures/blocks/portal_mya.png")
     save(redstone_link_tx(), "redstone-link-addon/redstone_link_RP/textures/blocks/redstone_link_tx.png")
     save(redstone_link_rx(), "redstone-link-addon/redstone_link_RP/textures/blocks/redstone_link_rx.png")